Alert archive / Texas / Mesoscale Discussions in 2008

Mesoscale Discussion 702

April 23, 200826 counties in Texas

The Storm Prediction Center issued this mesoscale discussion at Apr 23, 2008, 1:35 PM CDT for 26 counties in Texas. It was in force for 85 min.

The area

The outline as issued.

The facts

Issued: Apr 23, 2008, 1:35 PM CDT (18:35 UTC)
Expired: Apr 23, 2008, 3:00 PM CDT
In force: 85 min
Issued by: the Storm Prediction Center

All 26 counties

Andrews County, TX, Borden County, TX, Coke County, TX, Crane County, TX, Dawson County, TX, Ector County, TX, Fisher County, TX, Gaines County, TX, Glasscock County, TX, Howard County, TX, Irion County, TX, Martin County, TX, Midland County, TX, Mitchell County, TX, Nolan County, TX, Reagan County, TX, Runnels County, TX, Scurry County, TX, Sterling County, TX, Taylor County, TX, Terry County, TX, Tom Green County, TX, Upton County, TX, Ward County, TX, Winkler County, TX, Yoakum County, TX

The radar

The Midland/Odessa radar (KMAF), 45 km from the middle of the area, began a volume at 18:38 UTC, the scan nearest the moment this went out.

Open the radar archive at this moment

The archived warnings, watches and discussions in force at that minute are drawn over the scan, this one among them.

The watches that followed

Watches SPC issued over any of the same counties within four hours of this discussion.

The nearest sounding before it

Midland Regional, TX (KMAF), launched 12:00Z, 6.6 hours before the alert went out and 45 km from the middle of its area. This is the routine balloon launch nearest before it, the air the forecaster had in hand, not a measurement taken for the alert.

Skew-T log-p

Temperature in red, dew point in green, the mixed-layer parcel dashed.

Hodograph

The wind turning with height, colored by layer: ground to 1 km, 1 to 3 km, 3 to 6 km, 6 to 10 km.

Mixed-layer CAPE: 2797 J/kg
Mixed-layer CIN: -117 J/kg
Mixed-layer LCL: 758 m above ground
0-6 km bulk shear: 49 kt
0-1 km storm-relative helicity: 219 m²/s²
0-3 km storm-relative helicity: 211 m²/s²
Significant tornado parameter: 1.8
Supercell composite: 13.3

Open this sounding in Storm Lab

The text

As transmitted, in the capitals the NWS used until 2016.

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SPC that day

Everything else SPC issued on the same UTC day.

Issued	Product	Office	Counties	Lasted
Apr 23, 2:01 AM CDT	Mesoscale Discussion	SPC	Archer, Baylor, Clay, Wichita, Wilbarger	89 min
Apr 23, 7:31 AM CDT	Mesoscale Discussion	SPC	Armstrong, Baylor, Borden, Briscoe, Carson, Childress and 36 more	59 min
Apr 23, 9:32 AM CDT	Severe Thunderstorm Watch	SPC	Archer, Armstrong, Bailey, Baylor, Briscoe, Carson and 46 more	6 hr
Apr 23, 9:59 AM CDT	Mesoscale Discussion	SPC	Borden, Callahan, Coke, Dawson, Fisher, Garza and 18 more	61 min
Apr 23, 10:07 AM CDT	Tornado Watch	SPC	Andrews, Borden, Coke, Concho, Crane, Dawson and 25 more	6 hr
Apr 23, 11:42 AM CDT	Mesoscale Discussion	SPC	Clay, Collin, Cooke, Dallas, Denton, Fannin and 10 more	2 hr
Apr 23, 2:28 PM CDT	Mesoscale Discussion	SPC	Angelina, Bowie, Camp, Cass, Cherokee, Franklin and 18 more	3 hr
Apr 23, 3:16 PM CDT	Mesoscale Discussion	SPC	Andrews, Borden, Brown, Callahan, Coke, Coleman and 34 more	59 min
Apr 23, 3:25 PM CDT	Tornado Watch	SPC	Andrews, Borden, Brown, Callahan, Coke, Coleman and 44 more	8 hr
Apr 23, 3:37 PM CDT	Mesoscale Discussion	SPC	Armstrong, Briscoe, Carson, Childress, Collingsworth, Cottle and 15 more	53 min
Apr 23, 3:52 PM CDT	Severe Thunderstorm Watch	SPC	Armstrong, Bailey, Briscoe, Carson, Castro, Cochran and 31 more	4 hr
Apr 23, 5:43 PM CDT	Mesoscale Discussion	SPC	Andrews, Borden, Brown, Callahan, Coke, Coleman and 44 more	92 min
Apr 23, 6:20 PM CDT	Tornado Watch	SPC	Anderson, Bosque, Collin, Coryell, Dallas, Delta and 24 more	7 hr

Nearby

Mesoscale Discussions in Texas, 2008 Every mesoscale discussion in 2008

Sources

The product and its follow-ups from the Iowa Environmental Mesonet's archive of National Weather Service and Storm Prediction Center text; the sounding from the Mesonet's radiosonde archive; radar from the NEXRAD Level II archive.